Creping of paper



Pateme'd Noe. s, 1928.

UNITED STATES DAVID WILLIAM EUDSON, OF GREEN BAY, WISCONSIN.

CREPING OF PAPER.

Application filed May 21,

This invention relates to the creping of paper. 1

It is the object of the present invention to rovide a novel and simple creping mechamsm with which ungrooved feed rolls may be employed and which will nevertheless be free of clogging heretofore 'experienced ,in the attempted use of such rolls.

The machine of my invention employs a principle long known in the art and disclosed, for example, in German Patent 127,-

110 of 'January 6, 1902. The paper is driven by feed rolls into a restricted space between substantially parallel walls or blades which i take the' paper from the rolls and frictionally oppose its passage to such an extent that the paper folds itself in fine convolutions between the blades and, being packed therebetween by the continued operation of D the feed rolls, is ultimately forced from the remote end` of the space between the blades in the form of a finely convoluted or creped material.

It has been found difiicult to avoid` clogging of the paper between blades of any practical form. The pa er will inevitably clog if the edges of the Iblades are directly opposite each other in the path of movement of the paper; Cloggingis also likely where the blades are arranged as shown in the aforesaid German patent, the objection being that the restricted space between the blades is offset from the path of the paper and also both blades are reduced to an impracticably 5 thin knife edge. It is the purpose of the present inventlon to overcome these difliculties in a simple and practicable manner.

The drawings are purely diarammatical,

the details of the mechanism eing within 10 the knowledge of any mechanic Skilled in this art. I V

Fi re 1 is a diagrammatic section showing t e relation of blades and rolls in one embodiment of the present invention.

Figure 2 is asimilar view showing a slightly modified embodiment of the invention.

Like parts are identified b the same reference characters throughout t e several views.

As above indicated, one feature of my invention consists in the discovery that the restricted passage between the creping blades 5 and 6 should preferably open directly 1n line with the'path of the paper web 7 as it 55 leaves the feed rolls 8 and 9. This hasnot heretofore been possible without havmg the V is obviated. The drawing shows 1927. Serial No 193,086.

sharpened edges 10 and 11 of blades 5 and 6, respectively, directly opposite each other, 1n which case, the paper must inevitably become clogged therebetween.

In accordance with this invention the feed rolls 8 and 9 are made solid in un rooved cylindrical form. It Will be noted t at the rolls are of differing diameters. As a direct result of the difference in size of the feed rolls it will be obvious that the sharp edge 10 of blade 5 will be much nearer the point of bite 12 of the rolls than is the edge 11 of blade 6. Hence, despite the fact that blades 5 and 6 are mounted on the supporting members 15 substantially at right angles to a line joining the centers of the rolls, and despite the fact that the restricted space 16 'between the blades is directly aligned with the direction in Which the web 7 is fed through the rolls, such web will nevertheless pass margins 10 and 11 consecutively instead of simultaneously and hence the danger of clogging how the web is formed in convolution at 17 in the space 16 and emerges from such space between the supports 15 in the form of creped material. I'

It is desirable that the edges 10 and 11 of blades 5 and6 should conform as closel as possible to the peripheries of the ro s 8 and 9. Due to the arrangement above described, however, this can be done without grinding these edges to a razor like sharpness as has been necessary in the case of machines built in accordance with the above mentioned German patent. In constructing a machine in accordance with my invention the blades are ground with abrasive Wheels of substantially the identical diameter of the roll with which the particular blade is to be associated. Care is taken moreover to place the blades in the grinding machine in exactly the same position relative to the abrasive wheel which the blade will occupy in the creping mechanism. Each blade will be fairly thick and have a material arcuate bering on the periphery of its respective ro The degree of crepe will be governed by the spacing between the blades. VVhere a different degree of crepe is required a new set of supports 15 and blades 5 and 6 may be substituted to give the requisite spacing.

Under some circumstances it becomes desirable to increase the distance between edges 10 and 11 beyond the extent to which such edges are separated in the direction of paper travel in Figure 1. Also in some instances it may be d'esirable to use ,feed rolls of the same size and still to maintain a certain separation of edges 10 and 11 in the direction of travel of the web. In either case it is possible to accomplish tlie desired result by setting blades 25 and 26 at an angle with reference to 'the common tangent of the feed rolls 8 and 9. Except for the change in angular position and the consequent difference ingrinding, blades 25 and 26 correspond in all particulars with blades 5 and 6, tlie supporting frame members 15 being the same. It will be observed that the space between the blades is intersected by the common tangent of the feed rolls and hence is directly aligned with the path alon which the web 7 is fed between such rolls. n consequence of this arrangement the web will enter the creping chamber with a freedom which is impossible in any previous construction using rolls-of this type. Notwithstanding the fact that the side of thecreping chamber 27 into which the web enters is disposed directly in the path of the web it will be observed that the edges 30 and 31 of blades 25 and 26 are spaced apart for a very considerable distance in the direction of web advance. I have found both of these conditions to be important in creping paper or like materials in a machine of this character. It will be obvious that the angular position of blades 25 and 26 in the Figure 2 arrangement minimizes the desirability of havin the feed rolls of difi'ering sizes since the oset of edges 30 and 31 would occur in the Figure 2 arrangement even if rolls 8 and 9 were of the same size.

The term blades used in connection with members 25 and 26 has reference not merely to the form in which these members are illustrated but also to any means providing spaced walls between which the paper miiy be confined.

claim:

1. A device of the character described including a pair of feed rolls and a set of creping blades associated with the feed rolls at the delivery side thereof and spaced to receive a Web fed between said rolls, the edges of said blades bein offset in the direction of web advance and the space between f said blades being intersected by the common tangent of said rolls at the point at which such a web enters said space.

2. In a device of the character described,

the combination of a set of feed rolls of differing radii and creping blades in mutually lspaced relation associated with the delivery side of said rolls with their edges in peripheral contact with different rolls, whereby the edge of the blade associated with the smaller of said rolls will be nearer the line of bite between said rolls than the edge of the other of said blades.

3. In a device of the character described, the combination with a set of feed rolls of diiferinfl radi'i, of a set of creping blades Spaces from each other and having their edges fitted respectivelyto the larger and smaller rolls on the delivery slide thereof, whereby said edges are spaced in the direction of delivery from said rolls, that portion of the space between said blades nearest to the line of bite between said rolls bein intersected by the common tangent of sai rolls.

4. In a device of the character described the combination With a pair of feed rolls, of a set of mutually spaced creping blades in peripheral contact with said rolls at the delivery side thereof and inclined with reference to the common tangent of said rolls, whereby to space the edges of said blades in the direction of feed from said rolls.

5. In a device of the character described the combination with a pair of feed rolls, o a set of mutually spaced creping blades in peripheral contact with said rolls at the delivery side thereof and inclined with reference to the common tangent of said rolls, whereby to space the edges of said blades in the direction of feed from said rolls, that portionof the space between said blades which is closest to the line of bite between said rolls being intersected by said tan ent.

6. In a device of the character described, the combination with a pair of rolls of differing diameters, of a set of mutually spaced cre ing blades having their edges in erip eral contact respectively with the sma er and larger rolls, Whereby to advance'one of said edges from the other in the direction of feed from said rolls, said blades having their said edges disposed at either side of the common tangent of said rolls and bein thence inclined from said tangent toward the axis of the larger of said rolls whereby further to separate the respective edges of saiil blades in the direction of feed from said ro s.

DAVID WILLIAM HUDSON.

IDC 

